Service Communautaire d'Information sur la Recherche et le Développement - CORDIS

Optimised LiFePO4 and Li4Ti5O12 material grades for power applications

The result consists in the achievement of two optimised grades of LiFePO4 and Li4Ti5O12 as electrode materials for high power lithium batteries.

This LiFePO4 grade is able to deliver up to 80% of its capacity (165mAh/g) at continuous 10C rate. The other features of LiFePO4 are maintained: high cycle life (1000s of cycles), high safety/stability in the charged state, prolonged calendar life. Moreover this cheap material delivers similar energy density to LiCoO2 material. CEA optimised synthesis procedure leads to top performances in term of rate capability of the material compared to grades from other sources in the world. Part of the synthesis development is the subject of a patent, the remaining part is still a secret know-how.

Li4Ti5O12 grade is developped to find an optimum in term of tap density:rate capability ratio. This material is able to deliver 80% of its capacity (170mAh/g) at continuous 10C rate with a rather good tap density of 1.7 g/cm³ (for comparison high surface area Li4Ti5O12 0.7g/cm³).

Both materials are then suitable for high power application. Their expected low-cost is favourable to their use in large systems (HEV, EV) and consumer application such as power tools and electric bicycles.

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